In a centrifugal pump, which part is primarily responsible for conveying liquid?

In a centrifugal pump, the impeller is primarily responsible for conveying liquid. The impeller is a rotating component that spins within the casing of the pump. As it rotates, it creates a centrifugal force that pushes the liquid outward and towards the discharge of the pump. This kinetic energy imparted by the impeller's rotation is what allows the pump to effectively move the liquid from a lower pressure area to a higher pressure area, facilitating fluid transport through the system.

The volute, while important in collecting and directing the fluid flow after it exits the impeller, does not actively convey the liquid. Its role is to convert the kinetic energy of the fluid into pressure energy. Packing is mostly related to sealing the shaft to prevent leakage, and the shaft itself transmits rotational energy from the motor to the impeller, but neither of these components is responsible for conveying the liquid. The impeller's action is crucial, as it is the key mechanism that enables the effective movement of fluid in a centrifugal pump.